• Title/Summary/Keyword: EMG monitoring

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Intra-operative Neurological Monitoring and Anesthesia

  • Park, Sang-Ku;Lim, Sung-Hyuk;Park, Chan-Woo;Park, Jin-Woo;Kim, Dong-Jun;Kang, Ji-Hyuk;Jee, Hyo-Geun;Kim, Gi-Bong
    • Korean Journal of Clinical Laboratory Science
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    • v.44 no.4
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    • pp.184-198
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    • 2012
  • The purpose of intra-operative neurological monitoring (INM) is to minimize surgically induced nerve damage, sensory nerves and motor neurons without affecting the operations to proceed during surgery such as evoked potentials (EP), electromyography (EMG), electroencephalography (EEG), transcranial doppler (TCD), etc. During the course of checking a patient's condition, surveillance of ambulatory patients is a very different thing to check if the test is done under general anesthesia. INM can be possible or impossible depending on the type of drugs used and their concentrations because the monitoring is performed under anesthesia. Therefore, it is emphasized on the necessity of reviewing anesthesia which influences on INM.

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Development of Portable Power-Efficient Bio-Signal Monitoring System using Bluetooth for the elderly and the disabled (노약자와 장애인의 건강상태를 모니터링하기 위한 소형 저 전력 휴대용 Bio-signal 측정 장치의 개발)

  • Song, Kil-Sup;Jung, Hyun-Gwon;Song, Min;Bien, Zeung-Nam;Lee, He-Young
    • Proceedings of the KIEE Conference
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    • 2001.11c
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    • pp.176-179
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    • 2001
  • A portable bio-signal measurement system for 24-hours continuous health monitoring of the elderly and the disabled is presented. The measurement system has the functions of acquisition of various bio-signals such as ECG, EMG and EEG, wireless data transmission/receive and adjustment of parameters such as gain and cut-off frequency. The data is sent to a host computer or other device via a Bluetooth. The design targets of the developing system for volume and power consumption are $20{\times}30{\times}5(mm^3)$ and 8mW.

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High Efficiency Energy Harvester by Precision Tuning (정밀 튜닝기반의 고효율 에너지 하비스터)

  • Cho, S.W.;Choi, B.G.;Son, J.D.;Yang, B.S.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.04a
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    • pp.821-825
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    • 2008
  • Requirements of wireless sensor are increasing in machine condition monitoring. But, the limitation of battery power, self-power wireless sensor is necessary for the purpose of stand-alone operation. To overcome this problem, energy harvester is developed by the vibration energy. The purpose of this study is to develop a high efficiency energy harvester with high precision tuning.

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Optimum electrode selection for measuring the abdominal pressure using bio-impedance method (비침습적 복압 측정을 위한 생체 임피던스 전극의 최적 위치 선정)

  • An, Yang-Su;Kim, Keo-Sik;Song, Chul-Gyu
    • Proceedings of the KIEE Conference
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    • 2007.04a
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    • pp.46-48
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    • 2007
  • In this study, we determined the optimum electrode pair for measuring the abdominal pressure using bio-impedance method. Because impedance changes differ from a weight, a height, contractile force, volume of muscle and blood other or whatever of individuals, it was quantified using values of impedance change, correlation coefficient and SNR. Our results showed the optimum electrode pair (1, 9) which could detect impedance changes due to an increase of the intensity of the abdominal pressure. The correlation coefficient and quadratic function between the RMS values of EMG and the impedance changes were 0.87 and $y=0.0014x^2$+0.0620x+0.6958, respectively. It demonstrated that the abdominal pressure could be measured non-invasively and simply using bio-impedance method. We propose that this optimum electrode configuration would be useful for future studies involving the convenient measurement of abdominal pressure by ambulatory urodynamics monitoring study.

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Numerical Model for Cerebrovascular Hemodynamics with Indocyanine Green Fluorescence Videoangiography

  • Hwayeong Cheon;Young-Je Son;Sung Bae Park;Pyoung-Seop Shim;Joo-Hiuk Son;Hee-Jin Yang
    • Journal of Korean Neurosurgical Society
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    • v.66 no.4
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    • pp.382-392
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    • 2023
  • Objective : The use of indocyanine green videoangiography (ICG-VA) to assess blood flow in the brain during cerebrovascular surgery has been increasing. Clinical studies on ICG-VA have predominantly focused on qualitative analysis. However, quantitative analysis numerical modelling for time profiling enables a more accurate evaluation of blood flow kinetics. In this study, we established a multiple exponential modified Gaussian (multi-EMG) model for quantitative ICG-VA to understand accurately the status of cerebral hemodynamics. Methods : We obtained clinical data of cerebral blood flow acquired the quantitative analysis ICG-VA during cerebrovascular surgery. Varied asymmetric peak functions were compared to find the most matching function form with clinical data by using a nonlinear regression algorithm. To verify the result of the nonlinear regression, the mode function was applied to various types of data. Results : The proposed multi-EMG model is well fitted to the clinical data. Because the primary parameters-growth and decay rates, and peak center and heights-of the model are characteristics of model function, they provide accurate reference values for assessing cerebral hemodynamics in various conditions. In addition, the primary parameters can be estimated on the curves with partially missed data. The accuracy of the model estimation was verified by a repeated curve fitting method using manipulation of missing data. Conclusion : The multi-EMG model can possibly serve as a universal model for cerebral hemodynamics in a comparison with other asymmetric peak functions. According to the results, the model can be helpful for clinical research assessment of cerebrovascular hemodynamics in a clinical setting.

Optimum Electrode Selection for Measuring Abdominal Pressure using Bio-Impedance Method (생체 임피던스 방법을 이용하여 복압을 측정하기 위한 최적 전극위치 선정)

  • Kim, Keo-Sik;Lee, Sang-Ok;Seo, Jeong-Hwan;Kim, Kyeong-Seop;Song, Chul-Gyu
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.7
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    • pp.1339-1342
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    • 2007
  • In this study, we determined the optimum electrode pair for measuring the abdominal pressure using bio-impedance method and compared with conventional methods. Because impedance changes differ from a weight, a height, contractile force, volume of muscle and blood other or whatever of individuals, it was quantified using values of impedance change, correlation coefficient and SNR. Our results showed the optimum electrode pair (1, 9) which could detect impedance changes due to an increase of the intensity of the abdominal pressure. The correlation coefficient and quadratic function between the RMS values of EMG and the impedance changes were 0.87 and $y=0.0014x^2+0.0620x+0.6958$, respectively. It demonstrated that the abdominal pressure could be measured noninvasively and simply using bio-impedance method. We propose that this optimum electrode configuration would be useful for future studies involving the convenient measurement of abdominal pressure by ambulatory urodynamics monitoring study.

A Study on the Measuring EMG Signal Using Two-Dimensional images of the Fatigue analysis (2차원 영상을 이용한 근전도신호의 피로도 해석에 관한연구)

  • Kang, Byung-Jong;Lee, Young-Seock
    • Proceedings of the KAIS Fall Conference
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    • 2009.12a
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    • pp.1010-1013
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    • 2009
  • In this paper we propose the measurement of muscle fatigue using STFT(short time fourier transfom). The proposed method is time-frequency representation of muscle activity. We suggest that the proposed method can replace the classical muscle fatigue monitoring method using the median frequency.

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Hemifacial Spasm : A Neurosurgical Perspective

  • Kong, Doo-Sik;Park, Kwan
    • Journal of Korean Neurosurgical Society
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    • v.42 no.5
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    • pp.355-362
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    • 2007
  • Hemifacial spasm (HFS) is characterized by tonic clonic contractions of the muscles innervated by the ipsilateral facial nerve. Compression of the facial nerve by an ectatic vessel is widely recognized as the most common underlying etiology. HFS needs to be differentiated from other causes of facial spasms, such as facial tic, ocular myokymia, and blepharospasm. To understand the overall craniofacial abnormalities and to perform the optimal surgical procedures for HFS, we are to review the prevalence, pathophysiology, differential diagnosis, details of each treatment modality, usefulness of brainstem auditory evoked potentials monitoring, debates on the facial EMG, clinical course, and complications from the literature published from 1995 to the present time.

Portable Biofeedback Home Trainer for Patients with Constipation and Rectal Incontinence (변비 및 변실금 환자를 위한 휴대가 가능한 가정용 바이오피트백 치료기)

  • Ji, Jun-Keun;Cha, Guee-Soo;Lee, Moon-Ho
    • Proceedings of the KIEE Conference
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    • 2000.07d
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    • pp.3219-3221
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    • 2000
  • 본 논문에서는 바이오피드백(Biofeedback) 항문 괄약근 조절 시스템(Anal Spincter Control System)을 제작 및 구현하였다. 제작 및 구현된 시스템은 특발성 만성 변비증 및 특발성 만성 또는 신경인성 만성 변실금증 환자의 항문 괄약근 훈련 및 치료에 유용하다. 본 논문의 주된 내용은 마이크로 볼트 단위의 미세한 신호인 항문 괄약근 근전도 신호를 왜곡없이 증폭하여 검출하기 위한 바이오피드백 항문 괄약근 근전도 증폭기 (Anal EMG Amplifier) 및 신호처리기(Signal Processor)로 구성되어 있으며 사용자가 항문 괄약근 근전도 신호를 확인할 수 있도록 LED display와 스피커 출력 기능을 구현하여 monitoring을 가능하게 했다.

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Estimation of Instantaneous Bandwidth and Noise Rejection of ECG signals for 24-hours Continuous Health Monitoring System (24시간 건강 모니터링 시스템을 위한 심전도 신호의 순시 대역폭 추정 및 잡음 제거)

  • Song, Min;Choe, Jin-Myoung;Lee, He-Young
    • Proceedings of the IEEK Conference
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    • 2001.06e
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    • pp.89-92
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    • 2001
  • For the diagnosis of arrhythmia in the heart system, the QRS complex of ECG signals is used in many cases. The rejection of the noise in ECG signals is important to acquisition of exact QRS complex. This paper presents some experimental results about instantaneous bandwidth estimation and noise rejection of ECG signals with the purpose of rejection of the 60 Hz power noise and the motion artifacts such as EMG signals and contact noise. ECG signals corrupted by noise are cleaned by using the variable bandwidth filter. For the filtering of ECG signals with noise, the instantaneous bandwidth of the signals is estimated by analysis of time-frequency representation of ECG signal.

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